New 2026 Outdoors RV Back Country Series MTN TRX 27SPS Travel Trailer

Why We Chose This Back Country Series MTN TRX 27SPS
We selected this specific model because the 27SPS is the absolute powerhouse of the Back Country lineup, offering massive off-grid independence combined with an incredibly versatile layout. Built right here in the Pacific Northwest on Outdoors RV's signature custom-engineered cambered off-road HD chassis, this rig is purpose-built for rugged, primitive camping. It features a built-in Cummins Onan 3.6k onboard LP generator, a high-capacity solar setup, and heavy-duty suspension to take you deep into national forests where standard trailers can't go. Inside, you'll find a spacious living area with a deep slide-out, a full chef's kitchen with premium solid surface countertops, and an adaptable rear cargo/living space that makes it easy to bring your gear along for the adventure. Combined with thermal pane windows and factory-certified four-seasons block foam insulation, this coach handles extreme mountain climates effortlessly.

Highlights of this Unit:

• Onboard Power & Independence: Equipped with a factory-integrated Cummins Onan 3.6k LP generator and advanced solar prep to keep your systems running flawlessly miles away from the nearest hookups.

• True Mountain Tough Build: Constructed with a rugged, independently certified structural steel off-road frame, 2" bonded aluminum walls, and heavy-duty axles designed for rough backcountry roads.

• Spacious All-Weather Living: Features a deep slide-out room to maximize your interior living space, dual entry doors, a large walk-around master bed, and premium residential finishes.
  
  

The Sumner RV Difference
When you partner with Sumner RV, you are joining a 60-year legacy of integrity. As a family-run dealership hand-picked by the Nash family to carry on their tradition, we prioritize long-term customer relationships over transactional sales. To guarantee your absolute peace of mind, we invite new owners to spend their first night right here on our property along our year-round salmon creek—ensuring you are 100% comfortable with every feature before you head out to see Mt. Rainier.